Citation: Xiangkang Jiang, Zhixing Wang, Hong Dong, Xiang Zhang, Jin Hu, Manman Chu, Yanshuai Hong, Lei Xu, Wenjie Peng, Xiqian Yu, Jiexi Wang. An in-depth understanding of Al doping homogeneity affecting the performance of LiCoO₂ at cut-off voltage over 4.6 V[J]. Chinese Chemical Letters, ;2024, 35(12): 109553. doi: 10.1016/j.cclet.2024.109553 shu

An in-depth understanding of Al doping homogeneity affecting the performance of LiCoO₂ at cut-off voltage over 4.6 V

Xiangkang Jiang ^{a, b} ,
Zhixing Wang ^a ,
Hong Dong ^b ,
Xiang Zhang ^b ,
Jin Hu ^b ,
Manman Chu ^b ,
Yanshuai Hong ^b ,
Lei Xu ^c ,
Wenjie Peng ^{a, b, *,} ,
Xiqian Yu ^{c, *,} ,
Jiexi Wang ^{a, *,}

a.
Engineering Research Center of the Ministry of Education for Advanced Battery Materials, School of Metallurgy and Environment, Central South University, Changsha 410083, China
b.
BASF Shanshan Battery Materials Co., Ltd., Changsha 410205, China
c.
Beijing Advanced Innovation Center for Materials Genome Engineering, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China

pwj_csu@163.com

xyu@iphy.ac.cn

wangjiexikeen@csu.edu.cn

Received Date: 29 November 2023
Revised Date: 21 December 2023
Accepted Date: 19 January 2024
Available Online: 28 January 2024

Figures(3)

The increasing demand for energy density pushes LiCoO₂ (LCO) to work at higher voltage (≥4.5 V), which brings a series of problems including detrimental phase transition and structural instability. Various elemental doping has been proven an effective strategy to improve its structure stability. However, the understanding of elemental doping homogeneity effect is not enough, whether in terms of the controllability of doping homogeneity or its complex consequences. In this work, LCO powders with different Al doping homogeneity were synthesized and tested under high voltage (≥4.5 V) in both half and full cell at room and high temperature, respectively. The results show that the Al homogeneously doped LCO showed better cycling stability and rate performance compared to the inhomogeneous LCO sample. Particularly, the discharge capacity of Al homogeneously doped LCO after 500 cycles under 4.5 V in full cells could reach 160.1 mAh/g at 1.0 C with 94.1% capacity retention. Postmortem characterization demonstrates that a better doping homogeneity favors the stability of both the bulk and interface as well as the kinetic conditions. This study provided new insights about LCO performance fading, which sheds new light on the development of high-voltage LCO products
- Lithium-ion battery,
- Lithium cobalt oxide,
- Al-doping homogeneity,
- High voltage,
- Structural phase transition,
- Interfacial stability
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通讯作者: 陈斌, bchen63@163.com

1.
沈阳化工大学材料科学与工程学院沈阳 110142

An in-depth understanding of Al doping homogeneity affecting the performance of LiCoO2 at cut-off voltage over 4.6 V

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通讯作者: 陈斌, bchen63@163.com

An in-depth understanding of Al doping homogeneity affecting the performance of LiCoO₂ at cut-off voltage over 4.6 V